Product Instructions: Power: Press the power button for 2-3 seconds, along with red and blue lights, boot into the back even state. Power Pairing: Press the power button for 5-6 seconds, along with red and blue lights, after flashing red and blue alternately into pairing mode. VOL +: Press the volume + button for 2 seconds, add up the volume a maximum sound, a warning sound. VOL-: Press Volume – button for 2 seconds, cut down the volume a minimum sound, a warning sound. Previous: Press VOL+. Next: Press VOL-. Telephone Answering: when to call, press the power button. Refused to answer: when to call, press the power button for 2 seconds. Redial last telephone number: double-click on the standby power button. Charging: red light when charging, fully blue lights.